netdev - Re: [PATCH bpf-next v2] bpf: fix a compilation error when CONFIG_BPF

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Date:   Tue, 20 Nov 2018 15:23:06 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     ast@...com, daniel@...earbox.net, netdev@...r.kernel.org,
        kbuild-all@...org, kernel-team@...com,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH bpf-next v2] bpf: fix a compilation error when
 CONFIG_BPF_SYSCALL is not defined

On Tue, Nov 20, 2018 at 02:08:20PM -0800, Yonghong Song wrote:
> Kernel test robot (lkp@...el.com) reports a compilation error at
>   https://www.spinics.net/lists/netdev/msg534913.html
> introduced by commit 838e96904ff3 ("bpf: Introduce bpf_func_info").
> 
> If CONFIG_BPF is defined and CONFIG_BPF_SYSCALL is not defined,
> the following error will appear:
>   kernel/bpf/core.c:414: undefined reference to `btf_type_by_id'
>   kernel/bpf/core.c:415: undefined reference to `btf_name_by_offset'
> 
> When CONFIG_BPF_SYSCALL is not defined,
> let us define stub inline functions for btf_type_by_id()
> and btf_name_by_offset() in include/linux/btf.h.
> This way, the compilation failure can be avoided.
> 
> Fixes: 838e96904ff3 ("bpf: Introduce bpf_func_info")
> Reported-by: kbuild test robot <lkp@...el.com>
> Cc: Martin KaFai Lau <kafai@...com>
> Signed-off-by: Yonghong Song <yhs@...com>

Applied, Thanks